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5 Written questions

5 Matching questions

  1. What are compound machines?
  2. what is a wedge?
  3. ---> ----> Doing work?
  4. What two things do we need to know to calculate work?
  5. What is "power", scientifically speaking?
  1. a we need to know the size of the force that was put on the object, and how far the object moved.
  2. b the rate at which work is done.
  3. c Yes
  4. d a machine made of two or more simple machines. example: scissors, can openers
  5. e a double inclined plane that moves.

5 Multiple choice questions

  1. Yes
  2. you are only doing work on the ball as long as you are directly putting a force on it, in other words, when you are touching it.
  3. No. you are doing work on it when you pick it up, b/c when you pick it up, the direction of the movement of the object is the same as the direction of the force you are putting on it.
  4. a simple machine that has a fulcrum, or pivot point.
  5. Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.

5 True/False questions

  1. ^ ---> Doing work?No

          

  2. if you are pushing against a wall, are you doing work? explain.you are only doing work on the ball as long as you are directly putting a force on it, in other words, when you are touching it.

          

  3. what is a machine?a device that helps make work easier by changing the size or direction of a force.

          

  4. What is the scientific meaning of the word "work"?P=W / T, the unit Watts

          

  5. does a machine reduce the amount of work that is being done? Explain.Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.